[address-policy-wg] Re: Re: IPv6 allocations for 6RD

On Tue, Mar 01, 2011 at 10:24:46AM +0200, Ahmed Abu-Abed wrote:
> According to RFC 5969 for 6rd:
> 
> "  Embedding less than the full 32 bits of a CE IPv4 address is possible
>    only when an aggregated block of IPv4 addresses is available for a
>    given 6rd domain.  This may not be practical with global IPv4
>    addresses, but is quite likely in a deployment where private
>    addresses are being assigned to CEs. "
> 
> So the /64 limitation for 6rd applies when an aggregated block of IPv4
> addresses is not being used. 

I cannot read that in there. Above paragraphs talks about sub-32bit
mapping of IPv4 endpoint addresses. This is orthogonal to what the
prefix size for your customer delegation is.

Example: your 6RD domain is a /27 IPv4 block. You can serve that
with an IPv6 /51 block, giving each 6RD customer a /56.

IPv4 /27 == 5 relevant bits (host addressing), 51+5=56.

Best regards,
Daniel

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